Chicago is 2 hours ahead of Seattle. Seattle uses Pacific Time (PT, UTC-8/-7) while Chicago uses Central Time (CT, UTC-6/-5). When it's 12:00 PM in Seattle, it's 2:00 PM in Chicago.
Both cities observe daylight saving time on the same schedule, so the 2-hour difference remains constant throughout the year.
Best calling time: 7:00 AM - 3:00 PM Seattle time. This corresponds to 9:00 AM - 5:00 PM in Chicago, covering full business hours.
Seattle and Chicago are both major economic centers. Seattle's tech giants have offices in Chicago, and both cities are major airline hubs. Direct flights connect them in about 4 hours.